I’m on version 0.6.2 mac. I tried copy and pasting using both shortcut and manually but it wouldn’t paste.
So I tried using cut and it worked the first time, but could not paste. I tried to cut again and it didn’t work.

@davidlamhauge I meant to phisically copy the keyframe container on the timeline layer itself, but you’re right you should be able to copy the canvas contents of a keyframe with the steps you described, thanks!